Loom dobby



Se t. 18, 1928.

N. HEARD LOOM DOBBY Filed Jan. so, 1928 H U Invenrorf Nathan Heard b ffu awi Mam At 'rys.

Patented Sept. 18, 1 928 UNITED. STATES T I iesaese NATHAN HEARD, on vnwmo'n, MASSACHUSETTS, AssIGNon "ro DRAPER oonronn; TION, on'HorEnALE, assncnnsnrrs, A conronnrron' or MAINE.

LOOM Donny.

Application filed January 30.1928.lseriarn 250,355.

fingers shall not be substantially disturbed.

t is further necessary that the indicating fingers when in operation shall be prevented from rising from the axis on whlch they rock when they are lifted by the risers of the pat- 1:5 tern chain.

It is theobject of the present invention 'to provide asimple .and efiicient construction for mounting the indicating fingers to secure the proper rocking movement and a construction which will permit the expeditious removal and replacement of any fingerwithout disturbing the remainder.

It is the object of the present invention to f secure the foregoing result by a construction forming apart of the dobby and which does not require removal therefrom when an indieating finger is to be removed or replaced.-'

These and other objects and features of the invention will appear more fully from the accompanying description and drawln'gs.

Asthe invention is concerned only with one, feature of the dobby construction and as the general construction and operation of the dobby mechanism iswell known and familiar 3 tion is applicable to a wide range of dobby constructions, it is onlyv necessary hereto lllustrate anddescribe a portion of an ordinary 4 type of dobby mechanism, together with a therein. i V a In the drawings: t a r Fig. 1 is 'a View clnefiy n transverse vertical cross section taken through the fulcrum axis of the indicating fingers.

tially in longitudinal vertical cross section of the mechanism.

be removed. The dobby comprises the usual frame having the vertical sides 1 connected by suitable $5 transverse members including the front bar to those skilled in the art, and as the invenpreferred form of the invention embodied 2. The indicating fingers are arranged in a transverse serles and are all'of the same shape except at the rear ends. One set of fingers 3 have straight rear ends lcooperating with lifting rods 5 which control the upperhooks of the dobby, not shown. The other set of indicating fingers 6 have their rear ends 7 upturned and directly controlling the lower hooks 8 of the dobby. The indicatin fingers normally restat their front ends on the bar 2. These indicating fingers are controlled by risers 9 on the usual pattern chain running over a sprocket wheel 10 mounted on a shaft 11 extending transversely beneath the fingers;

When a riser 9 is moved by the pattern chain beneath a finger the finger is rocked, de-

pressing the rear end and thus allowing the corresponding hook to engage with the usual reciprocating knife 12and shift the'proper harness, all in a manner well known "and familiar to those skilled in the art.

In this construction the entire series er fingersarefulcrumed upon afulcrum shaft 13 journalled at its endsin the frame sides 1. Between the frame sides this shaft is of'segmental'cross section, thus presenting the flat surface 14 and thearcuate surface .15. Each indlq tlng finger is provided with a circular bearing aperture 16 of a diameter corresponding to the shaft so that it'fits closely the shaft and this circular bearing aperture has an opening through the bottom edge of the finger. One wall 17 of this opening is tangent with the aperture 16 and the other wall 1 8"isspacedfrom the w'a1l 17 a distance corresponding to the Shorter diameter of the Seg-"' mental cross section o'fthe fulcrum shaft.

In the construction shown, the fiat surface 14 of the fulcrum shaft is substantiallyhorizontal and the'opening 'fromtliecircular bearing aperture 16 through the bottom of'the finger is substantially'vertical when the parts are in the normal working position shown in J F igs. 1 and 3. Theindlcating fingers then rock on the fulcrum shaft 13 and are prevented from rising off from the shaft by rea Fig. 2 1s a view in side elevation and parson of the fact that the opening from the bearing aperture '16 in each finger is narrower than the greater diameter of," the'fulcrum. Fig. 3 is a detail showlngthe position of the fulcrum shaft and fingerwhen a finger is to surface ltparallel with the walls of the openon its axis substantially 90 bringing'the fiat ing fromthebearing aperture 16 through the I bottom edge of the finger or into the position the flat surface 14 of the fulcrum shaft is [thus shown as occupying either a substanl'ially horizontal-or. a substantially vertical position, it is obvious that any suitable angular relation may be adopted which will enable the fingers to have the proper rocking movement and to be removed, and replaced. The set of fingers 6 having the upturned rear ends 7 may have to be swung through quite a wide angle to enable them to be removed from the dobby frame, as shown in dotted lines'in Fig.2. The comb is herein shown as in two parts, 19 and 20, and located in a position where it will not interfere with the ready removal and replacement of the fingers. I

-. The two positions of the fulcrum shaft, that is,the osition shown in Fig. 3 when the indicating n'g ers are working and the position shown in Fig. 2 when a fingervis to be removed and replaced, may be determined by any suitable. means. In the construction illustrated, the fulcrum shaft 13 is shown as having 'a head 21 atone end bearing against theside frame, while at the other end the shaft'is provided witha radially projecting arm 22 and the frame is provided withstops 23 cooperating with the arm 22 and positioning the shaft in either of the respective desired positions.

It will thus be seenthat a construction is provided in which there is no additional member other than the fulcrum shaft forfsupp'orungrhe fingers either in operative position or whenthey are to be removed and relaced and that this fulcrum shaft always orms a permanent part of the dobby and is not rem ved therefrom when the fingers are to'be removed and replaced. It will also be s'eenthat the construction is such as to mainby Letters Patent, is:

, 1. Inna loom dobby the combination of a frame, a fulcrum shaft jo urn alled in the frame sides and havingtherebetween a portion of segmental cross section, and a series of indicating fingers fulcrumed on the shaft and each having a circular bearing aperture of a diameter to fit the shaft with an opening through the bottom edge, one wall of said opening being tangent with the aperture and the other wall being spaced therefrom a distance corresponding to the shorter diameter of said segmental portion whereby when the flat surface of the shaft is at the bottom, the fingers rock on the arcuate surface and are locked against removal and, when the shaft is rotated substantially ninety degrees, any

finger may be lifted off the shaft and replaced without disturbing the remainder.

2. In a loom dobby having theconstru'ction defined in claim 1, theycombination therewith of an arm projecting radially from one end of the fulcrum shaft and stops on the 'Lfranie which whenengaged by the arm position the shaft in the saidrotary positions.

3. In a loom dobbyhaving the constructio defined in claim 1, the combinationtherewith so i of means for positioning the fulcrum shaft in either of said rotary positions.

4. In a loom dobby the combination of a frame, afulcrumshaft journalledintheframe sides and having therebetween a portion of segmental cross section, and a'series of indifiat surface at the bottom an'd'perpen'dicw V lar to the tangent walls of said finger openings. or parallel therewith whereby, when in the former position, the fingers rock on the arcuate surface and are, locked against removal and, when in the latter position, any

finger may be need or he-S anna replaced without disturbing the remainder. I

5." In a loom dobby the combination "of a frame, a fulcrum shaft journalled in the frame sides, series of indicating fingers'fulcrumed on the shaft, the-bearing portion of the shaft being of segmental cross section and the fingers each'having a similar bearing aperture opening at the bottom edge cooperating with the bearing portion of, the shaft to per: init the fingers to rock without'remo'v'abili'ty when the shaftis in one rotary position and to permit any finger to be lifted off and replaced without disturbing the remainder when the shaft is in another rotary position. 6. In a loom dobby havingtheconstruction defined in claim 5, the provision of means for positioning the shaft in either of said rotary positions. V

In testimony whereof, I have signed my name to this specification.

NATHAN HEARD. 

